[Coco] Broken CC3

[George Ramsower]

----- Original Message ----- 
From: "Gene Heskett"

> On Friday 12 September 2008, George Ramsower wrote:
>>Darn,
>>
>> My CNC coco broke.
>>
>> It starts up and displays the usual stuff. I can ?mem and it reports
>>correctly. However, when I boot OS9, it crashes.
>>
>> I appears to crash when it loads the first boot sector.
>>
>>I tried other boot disks with the same results.
>>I replaced the CPU, RAM board, reseated the GIME, polished the edge
>>connector on the disk controller, reseated the ROM in the controller  and
>>all gives the same results.
>>
>> Suggestions?
>
> This smells like a memory problem as os9 put it in all ram mode.  Perhaps
> there is a problem with the memory above 32k?
>>

 This is why I replaced the memory board from another coco. I was thinking 
the same thing.
 The re-seating of things was the first step, then the memory, then the CPU.
 I think the next thing to try is another GIME chip. I've never had one fail 
before.
 I think I'll try that now and see.

George